356646421 has 2 divisors, whose sum is σ = 356646422. Its totient is φ = 356646420.

The previous prime is 356646373. The next prime is 356646449. The reversal of 356646421 is 124646653.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331786225 + 24860196 = 18215^2 + 4986^2 .

It is a cyclic number.

It is not a de Polignac number, because 356646421 - 2⁹ = 356645909 is a prime.

It is a super-2 number, since 2×356646421² = 254393339224218482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (356646221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 178323210 + 178323211.

It is an arithmetic number, because the mean of its divisors is an integer number (178323211).

Almost surely, 2^356646421 is an apocalyptic number.

It is an amenable number.

356646421 is a deficient number, since it is larger than the sum of its proper divisors (1).

356646421 is an equidigital number, since it uses as much as digits as its factorization.

356646421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 37.

The square root of 356646421 is about 18885.0846172317. The cubic root of 356646421 is about 709.1628173799.

The spelling of 356646421 in words is "three hundred fifty-six million, six hundred forty-six thousand, four hundred twenty-one".